package com.heima.article.service.Impl;

import com.alibaba.fastjson.JSON;
import com.heima.apis.wemedia.IWemediaClient;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.service.HotArticleService;
import com.heima.common.constants.ArticleConstants;
import com.heima.common.redis.CacheService;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.vos.HotArticleVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.wemedia.pojos.WmChannel;
import org.joda.time.DateTime;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class HotArticleServiceImpl implements HotArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    @Override
    public void computeHotArticle() {
        //1.查询前5天文章数据
        Date dateParam = DateTime.now().minusDays(5).toDate();
        List<ApArticle> apArticleList = apArticleMapper.findArticleListByLast5days(dateParam);

        //2.计算文章分值
        List<HotArticleVo> hotArticleVoList = computeHotArticle(apArticleList);

        //3.为每个频道缓存30条分值比较高的文章
        cacheTagToRedis(hotArticleVoList);

    }


    @Autowired
    private IWemediaClient iWemediaClient;

    @Autowired
    private CacheService cacheService;

    /**
     * 为每个频道缓存30条分值比较高的文章
     * @param hotArticleVoList
     */
    private void cacheTagToRedis(List<HotArticleVo> hotArticleVoList) {
        //为每个频道缓存30条分值较高的文章
        ResponseResult responseResult = iWemediaClient.getChannels();
        if (responseResult.getCode().equals(200)) {
            String channelJson = JSON.toJSONString(responseResult.getData());
            List<WmChannel> channelList = JSON.parseArray(channelJson, WmChannel.class);
            if (channelList != null && channelList.size() > 0) {
                for (WmChannel wmChannel : channelList) {
                    List<HotArticleVo> hotArticleVos = hotArticleVoList.stream().filter(hotArticleVo -> hotArticleVo.getChannelId().equals(wmChannel.getId())).collect(Collectors.toList());
                    //给文章进行排序，取30条分值比较高的文章存入redis  key：频道id   value：30条分值较高的文章
                    sortAndCache(hotArticleVos, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + wmChannel.getId());
                }
            }
        }
        //设置推荐数据
        //给文章进行排序，取30条分值较高的文章存入redis key:频道id   value：30条分值较高的文章
        sortAndCache(hotArticleVoList,ArticleConstants.HOT_ARTICLE_FIRST_PAGE + ArticleConstants.DEFAULT_TAG);
    }

    /**
     * 排序并且缓存数据
     * @param hotArticleVos
     * @param key
     */
    private void sortAndCache(List<HotArticleVo> hotArticleVos, String key) {
      hotArticleVos = hotArticleVos.stream().sorted(Comparator.comparing(HotArticleVo::getScore)).collect(Collectors.toList());
      if (hotArticleVos.size() > 30) {
          hotArticleVos = hotArticleVos.subList(0,30);
      }
      cacheService.set(key,JSON.toJSONString(hotArticleVos));
    }

    private List<HotArticleVo> computeHotArticle(List<ApArticle> apArticleList ) {
        ArrayList<HotArticleVo> hotArticleVoList = new ArrayList<>();
        if (apArticleList != null && apArticleList.size() > 0) {
            for (ApArticle apArticle : apArticleList) {
                HotArticleVo hotArticleVo = new HotArticleVo();
                BeanUtils.copyProperties(apArticle,hotArticleVo);
                Integer score = computeScore(apArticle);
                hotArticleVo.setScore(score);
                hotArticleVoList.add(hotArticleVo);
            }
        }
        return hotArticleVoList;
    }

    private Integer computeScore(ApArticle apArticle) {
        Integer score = 0;
        if (apArticle.getLikes() != null) {
            score += apArticle.getLikes() * ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT;
        }

        if (apArticle.getViews() != null) {
            score += apArticle.getViews();
        }

        if (apArticle.getCollection() != null) {
            score += apArticle.getCollection() * ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT;
        }

        if (apArticle.getComment() != null) {
            score += apArticle.getComment() * ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT;
        }

        return score;
    }
}
